The influence of fluid–structure interaction on cloud cavitation about a rigid and a flexible hydrofoil. Part 3

Experimental studies of the influence fluid–structure interaction on cloud cavitation about a stiff stainless steel (SS) and flexible composite (CF) hydrofoil have been presented in Parts I (Smith et al. , J. Fluid Mech. vol. 896, 2020 p. A1) II 897, b A28). This work further analyses data complements measurements with reduced-order model predictions to explain complex response. A two degrees-of-freedom steady-state is used why tip bending twisting deformations are much higher for CF hydrofoil, while hydrodynamic load coefficients very similar. one degree-of-freedom dynamic model, which considers spanwise deflection only, capture response both hydrofoils. Peaks frequency spectrum observed at re-entrant jet-driven shock-wave-driven cavity shedding frequencies, system heterodyne frequencies caused by mixing frequencies. The increase mean wider bandwidth modulation decreasing number. results show that, general, amplitude deformation fluctuation higher, but lower compared SS hydrofoil. Significant amplification subharmonic lock-in when matches nearest Both an absence primary because low intensity fluctuations high